Percussion-screen



(No Model.)

P. P. POORBAUGH. -PERCUSSION SCREEN.

` NT @www Patented Jan. 7, 1896.

my invention.

PI-IILLIP F. POORBAUGII, OF ALLEGHENY, ASSIGNOR TO THE PITTSBURG MINERALSCREEN COMPANY, OF PITTSBURG, `PENNSYLVANIA.

PERCUSSION-SCREEN.

SPECIFICATION forming part of Letters Patent No. 552,585, dated January7, 1896.

Application led March 2, 1895.` Serial No. 540,319. (No model.)

Myinvention relates to an improved screen to separate sand, dac., fromgravel more particularly; and it consists in certain details ofconstruction and combination of parts, as will be fully describedhereinafter.

In the accompanying` drawings, Figure 1 is al plan view of my improvedscreen, which is constructed and arranged in accordance with Fig. 2 is aside elevation of the same. Fig. 8 is a detailed plan view of the camand a portion of the connecting-rod. Fig. 4 is a side sectionalelevation of the same. Fig'. 5 is a sectional View of the lubricatingshaft and roller. Fig. 6 is a cross-section of the same.

To put myinvention into practice I provide a frame 1 of a suitable sizeand form of construction and arrange in an inclined position therein ascreen-frame 2.

of two vertical standards 3 rigidly attached to the frame l and providedwith a sliding bearing to which a swing-bar 4 is pivotally connected.This bar 4 is bent to pass beneath the frame of the screen and havebearings on suitable castings 5, which are provided with slottedopenings 6 and bolts by means of which the said castings 5 may be movedin the direction of the length of the frame of the screen and therebyafford a means for regulating the throw of the screen, as will behereinafter described. The rear end of the screen 2 is supported inabout the same manner by means of sliding bearings operating uponvertical standards 8, a swing-bar 9, and the said sliding bearingsprovided with set-screws as` a means of making the same rigid at anyings and provided with cams 11.

cams 11.

This screen 2 is` supported at the rear or high end by means point alongthe length of the said standards 8 to elevate or lower the discharge endof the screen.

Arranged at the front of the apparatus is a transverse shaft 10 mountedin suitable bear- These cams 1l operate in connection with two levers orconnecting-bars 12, (see Figs. 3 and 4,) the `other ends of theconnecting-bars attached to the frame 2 of the screen.V These bars 12are attached at either side of the frame of the screen 2 by means ofcastings pivoted to the said bars 12 and by means of a pin 14 to theframe, and the said castings provided with integral slotted arms 13capable of moving the said pivotal connections betweenthe bars 12 andcastings 14 in the direction of the length of the screen to regulate thethrow of the same without respect to the size of the The draw-bars orlevers 12 rest near their forward ends upon rolls or bearings 30suitably supported upon brackets 29 secured to the frame 1, as seen inFig. 4.

Connected to each side of the screen-box 2 at the discharge end arespring-couplings, each of which consists of a bar 26 pivoted to the box,having a swivel 27 through which a bar 16 is passed, having a strongspiral spring about the same, and the said bar 16 is coupled to athreaded eye-bar provided with a large hand-nut 28 by means of which thetension on the springs may be increased or diminished to regulate theforce ofthe blow of the screen.

A strong metal bar 17 is arranged at the discharge end of the screen toact asa bumper for the same, and provided with spring-buffers 17/ toreceive the blow.

Beneath the screen-box 2 is a pan 18 of a suitable form to receive thesubstance and discharge the same through an opening 20.

At the receiving end of the screen a suitable hopper 22 is placed, whichmay be of any desired construction.

To properly lubricate the rollers 24 and cams l1 the shaft 11 ishollowed at each end (see Figs. 5 and 6) and fitted with threaded lplugsto conne a suitable lubricant therein.

IOO

This shaft 11 is without rotation and moves horizontally with the motionof the bars 12 and is fitted with rollers 24, each having a small radialperforation 24', which when in a perpendicular position will registerwith another perforation 12 formed through the top wall of the oil-space11.

In operation a screen (not shown) is mounted in a frame equal to thelength and breadth of the screen-boX 2 and supported on the side pieces19. The power-shaft 10 is given a rotary movement, and the cams 1l,engaging with the rollers 24, move the screen-box 2 forward, and,suddenly releasing the same, the springs bring the box back forciblyagainst the buffers 17', giving the screen a jar to vibrate the wire ormetal used sufcient to prevent clogging and to sift the material throughthe meshes to the pan 1S below. By this construction the screen-box 2may be elevated or lowered on the standards 3 8, the force of the blowcan be increased or diminished by the springs, and the length of thestroke can be adjusted by means of the slotted connections 13irrespective of the size or throw of the cams 11, and also the force ofthe blow may be increased or diminished by operating the hand-nuts 28without regard to the length of the stroke of the cams. rlhe constantjar of the machine will constantly vibrate the shaft 11 and force smallquantities of oil from the opening 12' to properly lubricate the rollers24, and a portion of the said oil will pass through the openings 24 tolubricate the face of the cams 11.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. In a screen, the combination of the screen-box, the levers ordrawbars having their connected front ends provided with rolls orbearings, the brackets having rolls or bearings upon which rest the saidlevers or drawbars, near their forward ends, the shaft having the camsadapted to engage the rolls or bearings carried by said levers, thecastings pivoted to the sides of said screen-box, at their upper ends,and connected to the rear ends of said levers, at their opposite ends orangles, and provided with slotted arms adapted to provide for themovement of the pivotal connections between said levers and castings inthe direction of the length of the screen, substantially as set forth.

2. In combination with a screen constructed and operated as described,the cam and the hollow shaft 11 capable of containing a quantity of oil,a perforation 12 formed in the top, and a loose collar 24 andperforation arranged over the said oil chamber, the one perforation toregister with the other when the parts occupy a certain position,whereby the lubricant may be jarred drop by drop through theperforations, to lubricate the roller and its operating cam, as setforth.

In testimony that I claim the foregoing I hereunto affix my signaturethis 6th day of October, A. D. 1894.

PIIILLIP F. PGORBAUGH. [1..

WM. A. GOLDEN, M. E. HARRISON.

